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Theorem hbia1 1485
Description: Lemma 23 of [Monk2] p. 114. (Contributed by NM, 29-May-2008.)
Assertion
Ref Expression
hbia1  |-  ( ( A. x ph  ->  A. x ps )  ->  A. x ( A. x ph  ->  A. x ps )
)

Proof of Theorem hbia1
StepHypRef Expression
1 hba1 1474 . 2  |-  ( A. x ph  ->  A. x A. x ph )
2 hba1 1474 . 2  |-  ( A. x ps  ->  A. x A. x ps )
31, 2hbim 1478 1  |-  ( ( A. x ph  ->  A. x ps )  ->  A. x ( A. x ph  ->  A. x ps )
)
Colors of variables: wff set class
Syntax hints:    -> wi 4   A.wal 1283
This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-mp 7  ax-5 1377  ax-gen 1379  ax-4 1441  ax-ial 1468  ax-i5r 1469
This theorem is referenced by: (None)
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